Mine arrived ready to work with just a tiny amount of clean up. Vise was smooth operating, and very clean appearance. The bottom of the one I got is very flat, like wringing flat. Keyways are 14mm. Jaws open to 4-7/8" plus you can move the rear insert to the back of the movable jaw for a total of 8-15/16" clamping. The keys provided look to be MIM parts but they work and you can always make 1/2" or 5/8" keys if you need to. Crazy good value. A++++++++++++. Oh, yeah, the holes on my table are 5-3/8" apart and the vise bolted down perfect with 1/2" bolts.Bought another vise. This one in 6 inch (160 mm) size. Super happy with this one too. Jaws open to 163 mm and are 45 mm deep. Jaw inserts were ground on the vise and mate perfectly. You cannot see the joint when closed. I am sure I will if I remove them and don't put them back the same way however. Paint is great, Inside edges of bed are real sharp, as ground. May take a stone to them, or not. Great value.